Refs #4707, add test for netscaler logs, support already present due to last commit.

misc/log-analytics/import_logs.py

tests/PHPUnit/Fixtures/ManySitesImportedLogs.php

tests/PHPUnit/System/ImportLogsTest.php

...ted/test_ImportLogs__Actions.getEntryPageTitles_month.xml

...ted/test_ImportLogs__Actions.getEntryPageTitles_range.xml

...ected/test_ImportLogs__Actions.getEntryPageUrls_month.xml

...ected/test_ImportLogs__Actions.getEntryPageUrls_range.xml

...cted/test_ImportLogs__Actions.getExitPageTitles_month.xml

...cted/test_ImportLogs__Actions.getExitPageTitles_range.xml

...pected/test_ImportLogs__Actions.getExitPageUrls_month.xml

...pected/test_ImportLogs__Actions.getExitPageUrls_range.xml

...expected/test_ImportLogs__Actions.getPageTitles_month.xml

...expected/test_ImportLogs__Actions.getPageTitles_range.xml

...m/expected/test_ImportLogs__Actions.getPageUrls_month.xml

...m/expected/test_ImportLogs__Actions.getPageUrls_range.xml

...it/System/expected/test_ImportLogs__Actions.get_month.xml

...it/System/expected/test_ImportLogs__Actions.get_range.xml

..._ImportLogs__CustomVariables.getCustomVariables_month.xml

...cted/test_ImportLogs__DevicesDetection.getBrand_month.xml

..._ImportLogs__DevicesDetection.getBrowserEngines_month.xml